Impulse starting mechanism and method of operating the same



M. TOST. IMPULSE STARTIING MECHANIM AND METHOD OFOPERATING TH E SAME.

1 PPLiCATION FILED JAN. 2-, I918. I 1 1,338,758. Patented May 4,-192 0.

A TTORNEY the internal ronihustion oi AMERICAN BOSCH MAG 193013 9F NEWYORK.

E TAREING llIECIZ- Application filed l'anuzii'y id, 1913.

1 '0 (/[7 10/20/12 it may concern:

Be it known that 1, HA Tom, 11, SilbjQCL the Emperor of German troih intho county of h'lichig'zin. h

vo invented useful improvements in Mechanism ind L s E aine; and I do h'ehy dee ing to be a fulh clean, and e ct dose-Bi of the invention, suchwill eiuihle oboe skilled in the art. toivhich it zippoi'tniiis tonizilieiind use the same.

In general an impulse stzi mechanism has driving and driven meneonneoted respectively to rotary driving driven units and connerted eachother by an impelling spring. The impulse StLLl'lk ing mechanism alsohas locking iii-ecluinisni for holding the driven unit against nit-liton While the driving unit rot: Line; at slow speed in starting tothereby stress the inipelling spring upon relative angular displacementof'the units, and it also has releasing mechanism for releasing thelooking mechanism at a piedetormined angular position of the drivingunit to thereby porniit the iinpelling spring then ln asst, impel thedriven unit throu h no. sp n ate angle and a Y :r UOHlpfliiil'lY i leven. though the driving; unit time of release he rotating: at :it rest.

.ltis sometimes necessary to inipelling inoveinontone or more minstance, in the (use of :1 magneto ne w it is a riated for ignition PU.sometimes happens that the engine not; started into operation under itsown power by the first spark, even though the i'zylindi are primed andthe spark generated in inmolling movement. would ordinarily h:i'slzu'tory for ignition. A second spark then requireih or a third oreven 21 fourth Inay'be required under extremely adverse vonditions,siu-h 21s i'old cylinder Walls low compression. improper mixture" highstatic friction. etc. To turn the engine over to another tiring;- pointinvolves the rotath of 720 for the same cylinder or 180 tor the nextcylinder in the nine order 0" ll toiii'eyliiuler engine wherein, asusual the engine operates on the si-cyele plan.

This method of repeating the impeliin Speeilwotion of Letters ffzltent.

illtlfliOu heietoiore prior inc-i ii ot or may he 'esti out turn"' at xon may he disconnected by means of u r leasable coupling arranged in themechanical oonne 5 between them and preferably the (RH is arranged onthe rh'iving side of th, pulse staining iiletilitlilifill so that iismand i l" f 'ven unit are disc unit when lIil1-- ms, n

1 rest sed.

fired 1' oper fiitl ntl v on mu n nniuloining the on;

position. the Inn; lo being; return i. tnno to its a u nositionIUZUIHQUZT;

{.fklltiaiiViOI'l duixn 1e subsequent inipellii' movement.

Although in rini returning the driven unit angular relation W11 V a.unit in the no duced by th the driven u e i x r n I ,t the norm: l fiHQCoi? rotation. iiinouisin i prefer to iesivress tho impelhng springsiihseouent to the turmo movement of ti 'hiven zill 1) both in the sthough it is possible to di ]Kll()(l oi opomtion. 'hus "when a ooupli h[H installed between he. impuise start-mg mechanism and the engine, todisconnect that mechanism and the magneto from the en gine in order toretire a cylinder, I prefer to first turn the magneto against the normaldirection of rotation to its angular posi tion for maximum generation,and then to restress the impelling spring in returning the driven memberof the coupling for re connection to the other coupling member. In thisrestressing period, the magneto is held in its returned position by thelocking mechanism of the impulse starting mechanism, and when the springis restressed and the coupling members reconnected, the mag neto andengine are maintained in their predetermined angular relation, pendingthe operation of the releasing mechanism, as a result of the resistanceof the engine to angular movement.

This invention not only comprehends the foregoing methods of operatingthe impulse starting mechanism in repeating the impelling movementsthereof, but it also comprehends suitable apparatus for carrying outthose methods, in all suitable organizations including driving anddriven units and impulse starting mechanism therebetween.

In the accompanying drawings illustrating suitable apparatus of thiskind in application, as an example, to an engine organization,

Figure 1 is an elevation showing in section the magneto, the impulsestarting mechanism therefor, and the coupling installed, as an example,on the driving side of the impulse mechanism; Fig. 2 is a side elevationof the coupling on an enlarged scale; 3.is a top view of the coupling;and Figs. 4, 5 and 6 are diagrammatic views indicating the relativepositions of parts of the impulse "starting mechanism and the coupling,during the restless-ing period While the coupling members aredisconnected.

In the drawings, the engine 1 is of the -1- cylinder 4-cycle typedriving a bipolar magneto 2 through like gears 33, the releasablecoupling 4, and the impulse starting mechanism 5.

The magneto and the impulse starting mechanism therefor are identicalwith the disclosure in the application of W. E. Schwarzmann, Serial No.192,461, filed September 21, 1917, but, like the engine and thecoupling, may be of any type suitable for employment in accordance withthis invention.

The magneto has an armature 6 rotatable on an axis extending along thelength of the arms of the magnet 7. The impulse starting mechanism isinclosed by a hous ing .8 at the outer ends of the magnet. The drivingmember 9 and the driven member 10 of the coupling are fixedly mounted onthe coaxial shafts 11 and 12,, and the spring plate latches 13 arepivoted to the driving member so that they can be moved i'rom engagedpositions connecting the two coupling members, as shown in full lines in1 1g. 1, to the disengaged positions shown in broken lines in Fig. l fordisconnecting from the engine the magneto, the impulse startingmechanism, and the driven coupling member. The Hat springs 14 tend tohold the latches in either engaged or disengaged positions.

The driving member 26 of the impulse starting mechanism is fixed on theshaft 12 and carries the impelling and butler springs 15 and 16, and theinterposed abutments 17, together with the releasing cams 18. The drivenmember 27 of the impulse starting mechanism is fixed on the magnetoshaft 19 and carries the safety cams 20. The pressure applying arm 21 isloosely journaled on the driving member of the impulse startingmechanism and extends through slots in the driven member to turntherewith. The releasing cams, the safety cams, and the outer ends ofthe pressure applying arm coact with the locking pawl 22, which may beturned by the handle 23 between its locking positions shown in Figs. 5and 6 and its raised inoperative position shown in Fig. 4.

The impulse starting mechanism operates as follows for rotation inclockwise direction as viewed from the right in Fig. 1: The driving anddriven members are fixed on their shafts in such position that one ofthe safety cams 2O first comes under the pawl. followed by one end ofthe pressure applying arm 21, and then by one of the releasing cams 18.At slow speed in starting, the pawl 22, when in engaging position. ridessmoothly on the safety cam and remains in position to engage thepressure applying arm. At this position the arm, and therefore thedriven member fixed on the armature shaft, are locked against rotationwith the armature poles substantially bridging the spaces between thefield poles, that is a little prior to its angular pbsition' for maximumgeneration. Likewise the mechanical interrupter 24 is near its positionto start its interrupting movement. Further movement of the drivingmember of the impulse starting mechanism causes the abutments 17 tocompress the impelling spring between them and the pressure applyingarm, until the pawl 22 is lifted by one of the releasing cams 18, or bythe handle 23, to release the spring for its impelling movement of themagneto armature, the engine being so timed that one of its cylinders isat its firing point when the releasing cam releases the pawl. Theimpelling movement causes a suiliciently high speed of the armatureirrespective of the speed of the driving member at the time, and

be of the impulse staitiiw niacin the magneto armature {RC3 vpcsilzm tisto lliifll iliey wa s Coupling men; iei's zircili-en discunnected. by

back in an unti-c-loclm'ise through an appropriate sngle to generalssparks are iequirscl.

in accordance with the invni desired, u'liile maintaining fixed angularpOSllJlOIL 'vl. suc'lium; ills begini'iingof their pswsi' u to the timen eleasing can the pawl 22, as inilicziieal in i ina 'netq is in itsposit iinum gens'ntinn (luring; size subsequent inipslling'movement bythe ping th 1 stresssil. After each unsuccessful impelling of theenmovement, the angular positions gins, the coupling,- zinil Uriuncnsnged, b the pres indicated in i, lie

n this spring, as

i. mleasing the lil'iCilQS 13 am the i be]: of the (:nupling,ingeijliei' new armature and both 311k the impulsestarting-niecl1zinisi'n,

it locked against rotation by the pm ina'gnetn zii'iii:1t11i'e,tli1lsbsing returned iis position foifiinuximum gunei-ation. psi-ls than havethe angular pnsitimis in caterl in Fig. 5., aml the armature. the pressaa; w

sure zipplying arm illkl film s21 l st 0 locked in their pnsitions byilis piu'l. mm'

upan turning the driven i-nuplin g' inenilvr l in thenppnsileilii'sciinm film; is, in 'ijlllj normal (.lQClKWlSE (lu'ectlnncf i'otaiinn. ill d driving member 26 of time iinpuls g n mechanism is tn-nail and Clan ii'npel in spring 'esti'esss l betweenihe ulmtmen l andthe pressure applying arm until the, releasing cam 18 is again at ornear iliu position at \vliia'li it sin ts tn li'li tin). pziu'l. asingliciiieil in Fig. (3. The driving member of the wupling will llwn liein pnsilinn milie latches 13, to reconnei the magneio to the. engine.Tallinn this has been (lime. the impelling spring is held in fullyresti'esseil condition as a result of the resistance of ills engine toturning. To repeat tlie iinpelling movement. til? impelling springisthen leased by i'ziisingz' tla'e pawl 22 b v'znszins vi the handle 23,-Wliei-eupnn ilie magneto is impelled to generate unoilisr spark in illssame cylinder.

on in he uuiis. \(lliUll consists in discomwriinq t This opera ownpower, tluv my m i' v. lilil) innpei'ui'iic p0siengagement with thelam-l: by 7! i handle "23. 01 the pawl will in: 1 .1. 'i l il. inioun intum; pos um '7 if; (AIDS 24L if the pawl slioulil Mon to engage illspi'sssme apply i 11 1 the iinpellii IDOYQZZEP 2231i E 1".) i'essing theinipvliin spi'ii g the impulse starting: meclu :inisin while maintainingthe (liii'iiigi unit i i, and l'illfillp' A the impelli i impulse sineclmni i EOiiiifa dilating and (ll'ivsn iii-1's nuieii which .7 sis in(llSCODllPClllllfl: film from QfilQl: otlie mining ilu: driven ",](l L52' clix inipizllingr spring i in znevl unisin while n neciiiu; iesie wenieimnl in making the iinpvlling movement 0i an inipulsv stm'liingrinsnliz nisni arranged between'i'oizn'y ili'ning unil ili'imn units imiuizHll other. turning tlw illl lll llllli is bring: it in 2'iroilel'vi'minuil angular elation mil-1 respect in the driving unit.

Z'QSiE'PSSlHgI i'llvimpvlliug spring 0i ills im pulso starting ll)\lnnism, reconnen ng ills 11 units. and illlllil l'. Yule, l impsllingspa-i l. iluhmeiiimi of ropes-fling lie impellin n'un'einmii' of animpulse slzii'l'iugnievliunism arranged between X()i1li' driving anddriven The i haul of i'spe-ating ills lIHUPlll7l 12 movement of animpulse starting" niei-lmnism arranged bum-wen iy driving and driveni'liivli' nousis in iiis'nnnnuiiug 'tlio om uzii'li lulu-i3 iui'ningi'liu (ll'lVPl'E. ii, a pi'siletoi'niineil nngulzu: i3

relation with respect to the driving unit while maintaining the drivingunit at rest, restressing the impelling spring of the impulse startingmechanism, reconnecting the units in the predetermined angular relation,and finally releasing the restressed impelling spring.

(3. The method of repeating the impelling movement of an impulsestarting mechanism arranged between rotary driving and drive! units,which consists in disconnecting the impulse starting mechanism from thedriving unit, turning the driven unit and re stressing the impellingspring of the impulse starting mechanism while maintaining the drivingunit at rest, reconnecting the impulse starting mechanism to the drivingunit, and finally releasing the restressed impelling spring.

7. The method of repeating the impelling movement of an impulse startingmechanism arranged between rotary driving and driven units, whichconsistsin disconnecting the impulse starting mechanism from the drivingunit, turning the driven unit to bring it to a predetermined angularrelation with respect to the driving unit, restressing the impellingspring of the impulse starting mechanism while maintaining the drivingunit at rest, reconnecting the impulse starting mechanism to the drivingunit, and finally releasing the restressed impelling spring.

8. The method of repeating the impelling movement of an impulse startingmechanism having driving and driven members connected respectively torotary driving and driven units, which consists in disconnecting theimpulse starting mechanism from the driving unit, turning thedrivingmember of the impulse starting mechanism against the normaldirection of rotation to bring the driven unit to a predeterminedangular relation with respect to the driving unit, then turning thedriving member of the impulse-starting mechanism in the oppositedirection to restress the impelling spr ng while maintaining the unitsin that angular relation, reconnecting the impulse starting mechanism tothe driving unit, and finally releasing the restressed impelling spring.L

9. The method of retiring a cylinder of an internal combustion engine bymeans of a rotary magneto connected thereto through an impulse startingmechanism, which consists i'n disconnecting the magneto from the engine,returning the magneto to its position for maximum generation'during thesubsequent impelling movement while maintaining the engine in its firingposition, restressing the impelling spring of the impulse startingmechanism, reconnecting the magneto and engine, and finally releasingthe restressed impelling spring.

10. The method of refiring a cylinder Jf an internal combustion en ineby means of a rotary magneto connected thereto through an impulsestarting mechanism, which consists in disconnecting the magneto from theengine, returning the magneto to its position for maximum generationduring the subsequent i mpelling movement while maintaining the enginein its firing position, restressing the impelling spring of the impulsestarting mechanism, reconnecting the magneto to the engine, and finallyreleasing the restressed impelling spring.

11. The method of refiring a cylinder of an internal combustion engineby means of a rotary magneto connected thereto through an impulsestarting mechanism, which consists in. disconnecting the impulsestarting mechanism from the engine, returning the magneto to itsposition for maximum gen eration during the subsequent impellingmovement while maintaining the engine in its firing positibn,restressing the impelling spring of the impulse starting mechanism,reconnecting the impulse starting mechanism to the engine, and finallyreleasing the restressed impelling spring.

12. The method of refiring a cylinder of an internal combustion engine.by means of a' rotary magneto connected thereto through an impulsestarting mechanism, which consists in disconnecting the impulse startingmechanism from the engine, turning the magneto to its position formaximum generation during the subsequent impelling movement whilemaintaining the engine in its firing position, restressing the impellingspring of the impulse starting mechanism, reconnecting the impulsestarting mechanism to the engine, and finally releasing the restressedimpelling spring.

13. The combination of rotary driving and driven units, impulse startingmechanism arranged between the driving and driven units, and areleasable coupling arranged between the impulse starting mechanism andone of said units; substantially as and for the purpose described.

14. The combination of rotary driving and driven units, impulse startingmecha nism arranged between the driving and' driven units, and areleasable coupling arranged between the driving unit and the impulsestarting mechanism; substantially as and for the purpose described.

15. The combination of an internal com bustion engine, a rotary magnetotherefor, impulse starting mechanism-arranged between the engine andmagneto, and a releasable coupling arranged between the engine and theimpulse starting mechanis substantially as and for the purpose escribed.

In testimony whereof I affix my si naturei MAX 'I OST.

